wip: refactor pt.33: 33e; midi player traits

crates/tek_api/src/todo_api_plugin_lv2.rs

@@ -0,0 +1,61 @@
+use crate::*;
+
+/// A LV2 plugin.
+#[derive(Debug)]
+pub struct LV2Plugin {
+    pub world:        livi::World,
+    pub instance:     livi::Instance,
+    pub plugin:       livi::Plugin,
+    pub features:     Arc<livi::Features>,
+    pub port_list:    Vec<livi::Port>,
+    pub input_buffer: Vec<livi::event::LV2AtomSequence>,
+    pub ui_thread:    Option<JoinHandle<()>>,
+}
+
+impl LV2Plugin {
+    const INPUT_BUFFER: usize = 1024;
+    pub fn new (uri: &str) -> Usually<Self> {
+        let world = livi::World::with_load_bundle(&uri);
+        let features = world
+            .build_features(livi::FeaturesBuilder {
+                min_block_length: 1,
+                max_block_length: 65536,
+            });
+        let plugin = world
+            .iter_plugins()
+            .nth(0)
+            .expect(&format!("plugin not found: {uri}"));
+        Ok(Self {
+            instance: unsafe {
+                plugin
+                    .instantiate(features.clone(), 48000.0)
+                    .expect(&format!("instantiate failed: {uri}"))
+            },
+            port_list: plugin.ports().collect::<Vec<_>>(),
+            input_buffer: Vec::with_capacity(Self::INPUT_BUFFER),
+            ui_thread: None,
+            world,
+            features,
+            plugin,
+        })
+    }
+}
+
+impl LV2Plugin {
+    pub fn from_edn <'e> (jack: &Arc<RwLock<JackClient>>, args: &[Edn<'e>]) -> Usually<Plugin> {
+        let mut name = String::new();
+        let mut path = String::new();
+        edn!(edn in args {
+            Edn::Map(map) => {
+                if let Some(Edn::Str(n)) = map.get(&Edn::Key(":name")) {
+                    name = String::from(*n);
+                }
+                if let Some(Edn::Str(p)) = map.get(&Edn::Key(":path")) {
+                    path = String::from(*p);
+                }
+            },
+            _ => panic!("unexpected in lv2 '{name}'"),
+        });
+        Plugin::new_lv2(jack, &name, &path)
+    }
+}